JP2538195B2 - Magnetic tape device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic tape device applicable to a video tape recorder (hereinafter referred to as VTR) and the like, and more particularly to a magnetic tape device having a small tape running load and a small size.

[0002]

2. Description of the Related Art In recent years, VTRs have become popular in ordinary households and are used as time shift machines for television programs.

An example of the conventional VTR described above will be described below with reference to the drawings. FIG. 2 is a plan view of a main part of a conventional VTR. In FIG. 2, a magnetic tape 4 is wound around a supply reel 2 and a take-up reel 3 which are arranged side by side in a tape cassette 1, and the magnetic tape 4 that has come out from the supply reel 2 in parallel with the tape cassette 1 has several guides. After being guided by the member, the erasing head 5 and the first guide roller 6, it is twisted by the first inclined post 7 and helically wound around the rotary head cylinder 8. Rotating head cylinder 8
The magnetic tape 4 which has been attached is corrected by the second inclined post 9 so as to be parallel to the tape cassette 1 again, the traveling direction is changed by the second guide roller 10, and the magnetic tape 4 is attached to the fixed head 11. After that, the capstan 12 and the pinch roller 13 feed the tape cassette 1 and take it up by the take-up reel 3. The magnetic tape 4 is wound around the rotary head cylinder 8 in a substantially M-shape. It is called the M running system.

[0004]

However, in the above structure, since the tape winding angle on the first inclined post and the second inclined post is large, the tape running load is large and the magnetic tape is attached to the rotary head cylinder 8. From the viewpoint of tape damage and power consumption, it was quite difficult to form the fast winding mode with 4 attached.

In view of the above problems, the present invention provides a magnetic tape device having a traveling system in which a rotary head cylinder is attached in a substantially M-shape, and a tape traveling load is small.

[0006]

In order to solve the above-mentioned problems, a magnetic tape device of the present invention comprises a tape cassette having a pair of tape reels arranged side by side on a first plane and wound with a magnetic tape. A rotary head cylinder outside the tape cassette for winding the magnetic tape at a predetermined angle for recording and reproducing signals, and a tape drawer for pulling out the magnetic tape from the tape cassette and winding the magnetic tape around the rotary head cylinder in a substantially M-shape. And a magnetic tape drawn from the tape cassette outside the running path of the magnetic tape for twisting the magnetic tape whose running direction is parallel to the first plane from one of the tape reels of the tape cassette. At least one first tilt post provided between the first tilt post and the rotary head cylinder; Also, at least one rotation guide post provided perpendicular to a second plane parallel to the running direction of the magnetic tape twisted by the first inclined post, and to the rotary head cylinder via the rotation guide post. At least one magnetic tape, which is wound at a predetermined angle and has exited from the rotary head cylinder, is twisted, and is arranged outside the running path of the magnetic tape in order to make the running direction of the magnetic tape parallel to the first plane. A second inclined post of the book.

[0007]

According to the present invention, the tape winding angle on the inclined post can be made extremely small by the above construction, and a running system with a small tape running load can be realized, and the area occupied by the running system is small and compact. A VTR can be realized.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the magnetic tape device of the present invention will be described below with reference to the drawings.

FIG. 1 is a plan view of the essential parts of a VTR according to an embodiment of the present invention. In FIG. 1, a magnetic tape 24 is wound around a supply reel 22 and a take-up reel 23 which are arranged side by side in a tape cassette 21 placed in parallel with a first plane. In the state before the magnetic tape 24 is pulled out from the tape cassette 21, the supply side roller post 25 ′, the second rotation guide post 29 ′, and the third rotation guide post 3 are provided in the opening 37 provided in the front surface of the tape cassette 21.
2 ', the winding side roller post 36' is located. By moving these guide posts by a known tape drawing means (not shown), a tape running system as shown in FIG. 1 is formed. That is, the supply-side roller post 25 'is rotationally moved in parallel to the first plane to the position 25 in FIG. The second rotation guide post 29 'has the opening 3
While pulling out the magnetic tape 24 from 7 and gradually rising (upward in the direction perpendicular to the paper surface), the magnetic tape 24 is moved to the position 29 in FIG. Both the third rotation guide post 32 'and the take-up roller post 36' move parallel to the first plane and move to the positions 32 and 36 in FIG. 1, respectively. It should be noted that the pinch roller 41 is configured so as to be positioned in the tape running system after being pulled out from the cassette 21 so as to be lowered from the direction perpendicular to the upper surface of FIG.

Here, the structure of the tape running system is shown in FIG.
In this state, the magnetic tape 24 will be described according to the movement from the supply reel 22 to the take-up reel 23. Supply reel 22
From the tape cassette 21 in the direction parallel to the first plane from the magnetic tape 24,
5 is wound around and guided to the erasing head 26. Then, the magnetic tape 24 is twisted by being wound around the first inclined post 27, and the magnetic tape 24 is inclined from the state in which the traveling direction is parallel to the first plane to the upward direction perpendicular to the paper surface with respect to the first plane. The traveling direction is parallel to the second plane in which the vehicle travels. Then, the first surface provided perpendicularly to the second plane
Toward the rotation guide post 28.

More specifically, the first inclined post 27 is installed in the vicinity of the intersection 39 where the first plane and the second plane intersect each other, which is indicated by the alternate long and short dash line in FIG. The angle θ ₁ formed by the intersection 39 and the magnetic tape 24 that enters and exits is the same, and this angle θ ₁ is set at the position of the first rotation guide post 28.

Then, after that, the second rotation guide post 2
The magnetic tape 24 guided by 9 is helically wound around the rotary head cylinder 30 inclined in the direction of arrow 38. The magnetic tape 24, which is further twisted by winding it around the rotary head cylinder 30 by a predetermined angle, has a running direction parallel to a third plane different in inclination from the first plane and the second plane. Leave 30. Then, by twisting around the second inclined post 31, the twist is eliminated, the traveling direction becomes parallel to the first plane, and the third rotation guide post 32 provided perpendicular to the first plane is provided. Head to.

The second inclined post 31 has an intersection point 40 at which the first plane and the third plane intersect with each other, which is indicated by a chain line in FIG.
The angle θ ₂ formed by the intersecting line 40 and the magnetic tape 24 which is arranged in the vicinity and enters and leaves the second inclined post 31 is equal, and this angle θ ₂ is determined by the arrangement of the rotary head cylinder 30. Then, after that, the third rotation guide post 32
The running direction is directed toward the tape cassette 21, and the tape is attached to the fixed heads 33 and 34 and wound on the post-winding reel 23 wound around the winding-side roller post 36. Reference numeral 35 is a capstan, which has a known structure in which the magnetic tape 24 is driven in a fixed manner in cooperation with the pinch roller 41.

Here, the specifications of the rotary head cylinder 30 are as follows: outer diameter = φ62, lead angle = 5.935 °, tape winding angle = 190 °, tilt direction angle = 239.5 °, tilt angle 7.2 °. The specifications of each guide member are shown in (Table 1). The tilt direction angle is 0 ° with reference to the direction from the center of the supply reel 22 toward the take-up reel 23, and the counterclockwise direction is +. The tilt angle is 0 ° with reference to the line perpendicular to the first plane.

[0015]

[Table 1]

With the above-described structure, the wrap angle around the first inclined post 27 and the second inclined post 31 can be made extremely small. In the conventional M traveling system shown in FIG. 2, if the diameter of the rotary head cylinder and the tape winding angle are matched with those of the embodiment of the present invention, the winding angle around the first and second inclined posts 7 and 9 is about 120 °. . On the other hand, in the embodiment of the present invention, as shown in (Table 1), it is 48.5 °, and the traveling load on this inclined post is M in the M traveling system if the friction coefficient with the magnetic tape is 0.25. The size is about 1.37 times that of the embodiment of the present invention. This comparison increases as the friction coefficient increases, and the traveling system according to the present invention becomes advantageous.

In the present embodiment, in order to wind the magnetic tape running in the direction parallel to the first plane around the first rotation guide post perpendicular to the second plane, the magnetic tape is moved by one first inclined post. Although the tape is twisted, when it is desired to reduce the tilt angle of the tilted post, it is possible to twist a magnetic tape so that a plurality of adjacent tapes are provided and the running direction is parallel to the second plane. Needless to say.
Also, the second inclined post is also configured by one, but it is needless to say that a plurality of adjacent inclined posts can be provided when it is desired to reduce the inclination angle of the inclined post as in the case of the first inclined post. Yes.

[0018]

As described above, according to the present invention, a tape cassette having a pair of tape reels arranged side by side on the first plane and having a magnetic tape wound therein, and a magnetic tape provided outside the tape cassette. A rotary head cylinder for recording and reproducing a signal by winding the tape at a predetermined angle, a tape pull-out means for pulling out the magnetic tape from the tape cassette and winding the magnetic tape around the rotary head cylinder in a substantially M-shape, and one of the tape cassettes. At least one first inclined post disposed outside the traveling path of the magnetic tape pulled out from the tape cassette for twisting the magnetic tape whose traveling direction is parallel to the first plane from the reel. And between the first tilting post and the rotary head cylinder and twisted by the first tilting post. The parallel to the running direction of the magnetic tape 2
At least one rotary guide post provided perpendicular to the plane of the rotary head cylinder, and the magnetic tape wound around the rotary head cylinder through the rotary guide post at a predetermined angle and exiting the rotary head cylinder, and the magnetic tape runs. Since at least one second inclined post is provided outside the traveling path of the magnetic tape so as to make the direction parallel to the first plane, the inclined post of the traveling path of the magnetic tape is provided. It is arranged on the outer side, and it is not necessary to move this post when pulling out the magnetic tape, which is mechanically simple, and at the same time, the positional accuracy is improved and stable tape running can be obtained.

Further, since the tape traveling direction can be made parallel to the first plane by the second inclined post, the fixed head and the basic parts of the capstan can be constructed perpendicularly to the first plane, and the chassis processing and accuracy can be improved. The measurement is facilitated, and as a result, a magnetic tape device that is easy to manufacture can be realized.

Further, by combining the inclined post and the rotation guide post arranged outside the running path, the winding angle around the fixed guide member that determines the running load of the tape running system can be made small to greatly reduce the running load. It is possible to realize high speed running with the tape wound on the rotary head cylinder with a light load and without damaging the tape. Further, since it is a substantially M-shaped traveling system, it is not necessary to arrange a guide member or tape on the rear side of the rotary head cylinder, and the space of the tape traveling system is small as in the conventional M traveling system, so that the magnetic tape device is downsized. It is also suitable for

[Brief description of drawings]

FIG. 1 is a plan view of a main part of a magnetic tape device according to an embodiment of the present invention.

FIG. 2 is a plan view of a main part of a conventional magnetic tape device.

[Explanation of symbols]

 21 tape cassette 24 tape 27 first inclined post 28 first rotation guide post 29 second rotation guide post 31 second inclination post 32 third guide post

Claims (1)

(57) [Claims] 1. A tape cassette containing a pair of tape reels arranged side by side on a first plane and wound with a magnetic tape,
A rotary head cylinder outside the tape cassette that winds the magnetic tape at a predetermined angle to record and reproduce signals, and a tape drawer that pulls out the magnetic tape from the tape cassette and winds the magnetic tape in a substantially M-shape. And a magnetic tape drawn from the tape cassette outside the running path of the magnetic tape for twisting the magnetic tape whose running direction is parallel to the first plane from one of the tape reels of the tape cassette. At least one first inclined post provided, parallel to the running direction of the magnetic tape between the first inclined post and the rotary head cylinder and twisted by the first inclined post; At least one rotation guide post provided perpendicular to the second plane, and through the rotation guide post, The magnetic tape wound around the rotary head cylinder at a predetermined angle and exiting from the rotary head cylinder is twisted, and is disposed outside the running path of the magnetic tape so that the running direction of the magnetic tape is parallel to the first plane. And at least one second tilted post that has been formed.